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MediaElement fails playing WAV sound

General discussion

my Windows Store App uses a MediaElement, which is defined in XAML, to play WAV sounds. After over 500 running installations, one serious user reports, that the sound output completly fails on his computer. The only reason I know so far, which can cause
this problem, is that no audio devices are installed or activated in Windows. But the user hears sound in other Windows Store Apps and I could see from his screnshots, that he has 2 audio devices installed and activated.

I couldn't reproduce the issue on any of my test machines.

Do you have any knowledge or ideas, what else could be the reason for this odd bug?